Hello, Time-Nutters--
I have been sorting through items accumulated in my workshop
over the past 10 or 15 years which I will likely never have any
more use for. I came across an oscillator made by Wenzel
Associates, Austin Texas. Model 500-01301. I bought it to
replace the the original defective oscillator in a Motorola
communications signal analyzer / service monitor. The service
monitor worked fine for a decade or so after that but at some
point suffered a short on the freq synthesizer PC board which
damaged it beyond repair and the cost for a replacement board
was more than I wanted to invest in it. I saved some particular
components from the unit including the Wenzel precision
low-aging 1 MHz crystal oven oscillator.
I suppose I could put it on eBAY but have no idea how much
to ask for it. I thought I would pass it by the Time-Nuts
family first in case there is any interest in it. What is a
reasonable price to ask for this? $50 plus shipping?
Trade it for a racoon hunting beagle puppy plus shipping?
(Just kidding!)
Please-- any responses from fellow Time-Nutters should
be sent to me OFF-LIST so as not to load the List with
unnecessary traffic!
I still have the documentation info sheet that came with it
which says:
Very Low Aging 1 MHz Timekeeping Oscillator
Frequency 1 MHz
Output TTL Compatible
Stability / Aging +/- 2 X 10 -10/Day after 30 days
Temperature Stability +/- 8 X 10 -9, (+10 to +50 deg C)
Dimensions 2 X 2 X 4"
Connections 7-(solder) pin header
Pin-5 +10 V Reference Output
Pin-6 Electrical Tuning Input
Solder Sealed Steel Can
Supply +15 VDC
Coarse Frequency 2 X 10 -6
Fine Frequency +/- 2 X 10 -7 (+/-5 V)
Crystal 5 MHz SC-cut Third Overtone
with divide by 5 output
The output waveform was not symmetrical and the Motorola
service monitor did not like that so I cobbled up a simple PLL chip
to to deal to cure that issue.
I just powered it up and you can see the output waveform in the
Dropbox link below. The output was not properly loaded so it looks
a bit rough.
Photos can be seen at these Dropbox URLs:
https://dl.dropboxusercontent.com/u/60102282/Wenzel-%20Oscillator/Wenzel-1-WS.jpg
https://dl.dropboxusercontent.com/u/60102282/Wenzel-%20Oscillator/Wenzel-2-WS.jpg
https://dl.dropboxusercontent.com/u/60102282/Wenzel-%20Oscillator/Wenzel-3-WS.jpg
https://dl.dropboxusercontent.com/u/60102282/Wenzel-%20Oscillator/Wenzel-4-WS.jpg
Mike Baker
Micanopy, FL
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